03-31-2020, 09:48 PM
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#21 (permalink)
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Master EcoModder
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Location: Oregon
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A computer controlled automatic transmission should actually learn how you drive and adjust to protect itself. If you drive nice and easy your transmission will shift soft and early. If you drive it like a fire truck going to a fire the transmission will shift hard and late. The computer raises the line pressure to protect itself, this makes for quick and very stiff shifts. When you clear trouble codes most newer cars reset the learn function and you have to start over training your car how you drive.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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Other popular topics in this forum...
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04-01-2020, 02:54 PM
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#22 (permalink)
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Cyborg ECU
Join Date: Mar 2011
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So, if I bought a used 06 BMW 325i with the auto trans and it has never had DTCs cleared, I might expect that it is still working on old driving assumptions? Even after 13 months? Could that help explain slightly hard shifting out of first and second gear?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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04-01-2020, 03:34 PM
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#23 (permalink)
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Rat Racer
Join Date: May 2011
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Because sporty.
It's a feature.
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Quote:
Originally Posted by sheepdog44
Transmission type Efficiency
Manual neutral engine off.100% @∞MPG <----- Fun Fact.
Manual 1:1 gear ratio .......98%
CVT belt ............................88%
Automatic .........................86%
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04-01-2020, 05:08 PM
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#24 (permalink)
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Master EcoModder
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Location: Oregon
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I would expect even a BMW to adapt to your driving style in 10 drive cycles or so. They start off with factory defaults only if the codes are cleared. You should never have soft long shifts in anything sporty.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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04-20-2020, 10:39 AM
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#25 (permalink)
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Master EcoModder
Join Date: Jan 2011
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288,000 miles on my Cobalt, suspension almost all original. I have never replaced struts on any cars but this is the most miles I've ever put on one and think I can get 2 more years out of it (60,000 miles or so). Rust is starting and have had to replace some fuel line already.
Is it worth replacing struts?
Do they really have any effect on tire life if not leaking oil? (One's been clunking on bumps for 5+ years, I think it the top mount).
It ate the current set of front in 18,000 miles I couldn't find anything loose yesterday and had the car aligned once it it's life a 2 years or so ago. Going to try to get the get alignment checked tomorrow and see if he can see something loose that I didn't.
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04-20-2020, 11:04 AM
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#26 (permalink)
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Master EcoModder
Join Date: Jun 2008
Location: Oregon
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I am sure that new struts will make your car better. The cost of the struts will help save on future tire wear. Delta chassis GM cars do wear front suspension parts. Some struts wear out in 60,000 miles on them when driven on rough roads. Discuss this with your alignment person. Loaded struts come complete and solves the problem with rusty springs also.
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02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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04-20-2020, 11:49 AM
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#27 (permalink)
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Master EcoModder
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I recently had someone tell me there was no way my struts were still good at 260k miles, he was under the impression they should all be replaced at 60k. We did a bounce test and the dampening still seems fine. I can't say I've ever owned a vehicle without a zillion miles, so I'm not the best judge. If it seems fine, it's fine?
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04-20-2020, 12:51 PM
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#28 (permalink)
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Master EcoModder
Join Date: May 2019
Location: California
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2020 - '08 Chevy Tahoe H Last 3: 18.4 mpg (US) 2021 - '08 Chevy Tahoe H 90 day: 17.08 mpg (US) 2022 - '08 chevy Tahoe LT Last 3: 14.38 mpg (US) 2023 - '08 Chevy Tahoe Last 3: 22.61 mpg (US) 2024 - '08 Chevy Tahoe 90 day: 22.35 mpg (US)
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Quote:
Originally Posted by roosterk0031
288,000 miles on my Cobalt, suspension almost all original. I have never replaced struts on any cars but this is the most miles I've ever put on one and think I can get 2 more years out of it (60,000 miles or so). Rust is starting and have had to replace some fuel line already.
Is it worth replacing struts?
Do they really have any effect on tire life if not leaking oil? (One's been clunking on bumps for 5+ years, I think it the top mount).
It ate the current set of front in 18,000 miles I couldn't find anything loose yesterday and had the car aligned once it it's life a 2 years or so ago. Going to try to get the get alignment checked tomorrow and see if he can see something loose that I didn't.
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if one is broken and you know it's broken you can be liable if that causes an accident i.e wheel falls off hits another car., or you lose control and causes an accident |
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04-20-2020, 10:32 PM
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#29 (permalink)
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Master EcoModder
Join Date: Jun 2008
Location: Oregon
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Thanks: 258
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You said you had a clunk, something is wrong and it may be from rust. Your needs to have a professional alignment person give it a once over. You can then decide what you need to do.
__________________
02 Saturn L200 5 speed- 265k miles
84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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04-21-2020, 03:04 PM
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#30 (permalink)
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Batman Junior
Join Date: Nov 2007
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thanks thanks
Quote:
Originally Posted by me and my metro
I am a life long professional mechanic and am offering advice on auto and truck repair issues. I have been a moderator on a Saturn specific site for a couple years but the site does not like my vpn. So I am offering my services here. I will try to provide correct information to all.
Andy
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I don't have a mechanical problem to sort out at the moment... I just wanted to say THANKS for being so generous with your time & expertise.
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